Christian missionary (7)
I believe the answer is:
apostle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">christian missionary</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for apostle that I've seen before include "'Matthew or Mark, say (7)'" , "Augustine, say" , "Leaps to find teacher of faith" , "Preacher perhaps" , "Thaddeus, perhaps" .)